LoadLifter 5000 Ultimate kits are specifically engineered for hauling or towing heavy loads. LoadLifter 500 air springs are designed to fit popular vehicles like 3/4 ton and one-ton 4WD pickup trucks. Air Lift adjustable air springs work with your existing suspension to give your vehicle more leveling support when you need it, so your vehicle is always level and stable. Proper weight distribution to all tires means more safety and a more comfortable ride as well. LoadLifter 5000 air springs provide up to 5,000 pounds of leveling capacity* for support of your heaviest loads.